Our teacher always speaks slowly and clearly in class .
A. so as to be understood
B. to have understood
C. so as to understand
D. to understand
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(答案→)A. so as to be understood
B. to have understood
C. so as to understand
D. to understand
解析：考查固定搭配。so as to do sth=in order to do sth为了做某事，Our teacher和understand之间是动宾关系，即“老师被同学们理解”，故使用被动语态，排除B、C、D，故选A。